/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.aggregations.bucket;

import org.opensearch.action.search.SearchPhaseExecutionException;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.cluster.health.ClusterHealthStatus;
import org.opensearch.plugins.Plugin;
import org.opensearch.script.MockScriptPlugin;
import org.opensearch.script.Script;
import org.opensearch.script.ScriptType;
import org.opensearch.search.aggregations.AggregationBuilders;
import org.opensearch.search.aggregations.bucket.range.Range;
import org.opensearch.test.OpenSearchIntegTestCase;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.function.Function;

import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertSearchResponse;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.instanceOf;

@OpenSearchIntegTestCase.SuiteScopeTestCase
public class IpRangeIT extends OpenSearchIntegTestCase {

    public static class DummyScriptPlugin extends MockScriptPlugin {
        @Override
        public Map<String, Function<Map<String, Object>, Object>> pluginScripts() {
            return Collections.singletonMap("dummy", params -> null);
        }
    }

    @Override
    protected Collection<Class<? extends Plugin>> nodePlugins() {
        return Arrays.asList(DummyScriptPlugin.class);
    }

    @Override
    public void setupSuiteScopeCluster() throws Exception {
        assertAcked(prepareCreate("idx").setMapping("ip", "type=ip", "ips", "type=ip"));
        waitForRelocation(ClusterHealthStatus.GREEN);

        indexRandom(
            true,
            client().prepareIndex("idx").setId("1").setSource("ip", "192.168.1.7", "ips", Arrays.asList("192.168.0.13", "192.168.1.2")),
            client().prepareIndex("idx").setId("2").setSource("ip", "192.168.1.10", "ips", Arrays.asList("192.168.1.25", "192.168.1.28")),
            client().prepareIndex("idx")
                .setId("3")
                .setSource("ip", "2001:db8::ff00:42:8329", "ips", Arrays.asList("2001:db8::ff00:42:8329", "2001:db8::ff00:42:8380"))
        );

        assertAcked(prepareCreate("idx_unmapped"));
        waitForRelocation(ClusterHealthStatus.GREEN);
        refresh();
    }

    public void testSingleValuedField() {
        SearchResponse rsp = client().prepareSearch("idx")
            .addAggregation(
                AggregationBuilders.ipRange("my_range")
                    .field("ip")
                    .addUnboundedTo("192.168.1.0")
                    .addRange("192.168.1.0", "192.168.1.10")
                    .addUnboundedFrom("192.168.1.10")
            )
            .get();
        assertSearchResponse(rsp);
        Range range = rsp.getAggregations().get("my_range");
        assertEquals(3, range.getBuckets().size());

        Range.Bucket bucket1 = range.getBuckets().get(0);
        assertNull(bucket1.getFrom());
        assertEquals("192.168.1.0", bucket1.getTo());
        assertEquals("*-192.168.1.0", bucket1.getKey());
        assertEquals(0, bucket1.getDocCount());

        Range.Bucket bucket2 = range.getBuckets().get(1);
        assertEquals("192.168.1.0", bucket2.getFrom());
        assertEquals("192.168.1.10", bucket2.getTo());
        assertEquals("192.168.1.0-192.168.1.10", bucket2.getKey());
        assertEquals(1, bucket2.getDocCount());

        Range.Bucket bucket3 = range.getBuckets().get(2);
        assertEquals("192.168.1.10", bucket3.getFrom());
        assertNull(bucket3.getTo());
        assertEquals("192.168.1.10-*", bucket3.getKey());
        assertEquals(2, bucket3.getDocCount());
    }

    public void testMultiValuedField() {
        SearchResponse rsp = client().prepareSearch("idx")
            .addAggregation(
                AggregationBuilders.ipRange("my_range")
                    .field("ips")
                    .addUnboundedTo("192.168.1.0")
                    .addRange("192.168.1.0", "192.168.1.10")
                    .addUnboundedFrom("192.168.1.10")
            )
            .get();
        assertSearchResponse(rsp);
        Range range = rsp.getAggregations().get("my_range");
        assertEquals(3, range.getBuckets().size());

        Range.Bucket bucket1 = range.getBuckets().get(0);
        assertNull(bucket1.getFrom());
        assertEquals("192.168.1.0", bucket1.getTo());
        assertEquals("*-192.168.1.0", bucket1.getKey());
        assertEquals(1, bucket1.getDocCount());

        Range.Bucket bucket2 = range.getBuckets().get(1);
        assertEquals("192.168.1.0", bucket2.getFrom());
        assertEquals("192.168.1.10", bucket2.getTo());
        assertEquals("192.168.1.0-192.168.1.10", bucket2.getKey());
        assertEquals(1, bucket2.getDocCount());

        Range.Bucket bucket3 = range.getBuckets().get(2);
        assertEquals("192.168.1.10", bucket3.getFrom());
        assertNull(bucket3.getTo());
        assertEquals("192.168.1.10-*", bucket3.getKey());
        assertEquals(2, bucket3.getDocCount());
    }

    public void testIpMask() {
        SearchResponse rsp = client().prepareSearch("idx")
            .addAggregation(
                AggregationBuilders.ipRange("my_range")
                    .field("ips")
                    .addMaskRange("::/0")
                    .addMaskRange("0.0.0.0/0")
                    .addMaskRange("2001:db8::/64")
            )
            .get();
        assertSearchResponse(rsp);
        Range range = rsp.getAggregations().get("my_range");
        assertEquals(3, range.getBuckets().size());

        Range.Bucket bucket1 = range.getBuckets().get(0);
        assertEquals("::/0", bucket1.getKey());
        assertEquals(3, bucket1.getDocCount());

        Range.Bucket bucket2 = range.getBuckets().get(1);
        assertEquals("0.0.0.0/0", bucket2.getKey());
        assertEquals(2, bucket2.getDocCount());

        Range.Bucket bucket3 = range.getBuckets().get(2);
        assertEquals("2001:db8::/64", bucket3.getKey());
        assertEquals(1, bucket3.getDocCount());
    }

    public void testPartiallyUnmapped() {
        SearchResponse rsp = client().prepareSearch("idx", "idx_unmapped")
            .addAggregation(
                AggregationBuilders.ipRange("my_range")
                    .field("ip")
                    .addUnboundedTo("192.168.1.0")
                    .addRange("192.168.1.0", "192.168.1.10")
                    .addUnboundedFrom("192.168.1.10")
            )
            .get();
        assertSearchResponse(rsp);
        Range range = rsp.getAggregations().get("my_range");
        assertEquals(3, range.getBuckets().size());

        Range.Bucket bucket1 = range.getBuckets().get(0);
        assertNull(bucket1.getFrom());
        assertEquals("192.168.1.0", bucket1.getTo());
        assertEquals("*-192.168.1.0", bucket1.getKey());
        assertEquals(0, bucket1.getDocCount());

        Range.Bucket bucket2 = range.getBuckets().get(1);
        assertEquals("192.168.1.0", bucket2.getFrom());
        assertEquals("192.168.1.10", bucket2.getTo());
        assertEquals("192.168.1.0-192.168.1.10", bucket2.getKey());
        assertEquals(1, bucket2.getDocCount());

        Range.Bucket bucket3 = range.getBuckets().get(2);
        assertEquals("192.168.1.10", bucket3.getFrom());
        assertNull(bucket3.getTo());
        assertEquals("192.168.1.10-*", bucket3.getKey());
        assertEquals(2, bucket3.getDocCount());
    }

    public void testUnmapped() {
        SearchResponse rsp = client().prepareSearch("idx_unmapped")
            .addAggregation(
                AggregationBuilders.ipRange("my_range")
                    .field("ip")
                    .addUnboundedTo("192.168.1.0")
                    .addRange("192.168.1.0", "192.168.1.10")
                    .addUnboundedFrom("192.168.1.10")
            )
            .get();
        assertSearchResponse(rsp);
        Range range = rsp.getAggregations().get("my_range");
        assertEquals(3, range.getBuckets().size());

        Range.Bucket bucket1 = range.getBuckets().get(0);
        assertNull(bucket1.getFrom());
        assertEquals("192.168.1.0", bucket1.getTo());
        assertEquals("*-192.168.1.0", bucket1.getKey());
        assertEquals(0, bucket1.getDocCount());

        Range.Bucket bucket2 = range.getBuckets().get(1);
        assertEquals("192.168.1.0", bucket2.getFrom());
        assertEquals("192.168.1.10", bucket2.getTo());
        assertEquals("192.168.1.0-192.168.1.10", bucket2.getKey());
        assertEquals(0, bucket2.getDocCount());

        Range.Bucket bucket3 = range.getBuckets().get(2);
        assertEquals("192.168.1.10", bucket3.getFrom());
        assertNull(bucket3.getTo());
        assertEquals("192.168.1.10-*", bucket3.getKey());
        assertEquals(0, bucket3.getDocCount());
    }

    public void testRejectsScript() {
        IllegalArgumentException e = expectThrows(
            IllegalArgumentException.class,
            () -> client().prepareSearch("idx")
                .addAggregation(
                    AggregationBuilders.ipRange("my_range")
                        .script(new Script(ScriptType.INLINE, "mockscript", "dummy", Collections.emptyMap()))
                )
                .get()
        );
        assertThat(e.getMessage(), containsString("[ip_range] does not support scripts"));
    }

    public void testRejectsValueScript() {
        IllegalArgumentException e = expectThrows(
            IllegalArgumentException.class,
            () -> client().prepareSearch("idx")
                .addAggregation(
                    AggregationBuilders.ipRange("my_range")
                        .field("ip")
                        .script(new Script(ScriptType.INLINE, "mockscript", "dummy", Collections.emptyMap()))
                )
                .get()
        );
        assertThat(e.getMessage(), containsString("[ip_range] does not support scripts"));
    }

    public void testNoRangesInQuery() {
        try {
            client().prepareSearch("idx").addAggregation(AggregationBuilders.ipRange("my_range").field("ip")).get();
            fail();
        } catch (SearchPhaseExecutionException spee) {
            Throwable rootCause = spee.getCause().getCause();
            assertThat(rootCause, instanceOf(IllegalArgumentException.class));
            assertEquals(rootCause.getMessage(), "No [ranges] specified for the [my_range] aggregation");
        }
    }
}
